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   "source": [
    "#15: Non Destructive Testing"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##Example number 15.1, Page number 412"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
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   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The frequency to which a piezo electric oscillator circuit should be turned is 2.7451 *10**6 Hz\n"
     ]
    }
   ],
   "source": [
    "#importing modules\n",
    "import math\n",
    "from __future__ import division\n",
    "\n",
    "#Variable declaration\n",
    "t=0.1*10**-2;   #thickness of piezo electric crystal(m)\n",
    "E=80*10**9;     #Young's modulus of crystal(pa)\n",
    "d=2654;     #density of material of crystal(Kgm^-3)\n",
    "\n",
    "#Calculation\n",
    "f=1/(2*t)*math.sqrt(E/d);     #The frequency to which a piezo electric oscillator circuit should be turned(Hz)\n",
    "\n",
    "#Result\n",
    "print \"The frequency to which a piezo electric oscillator circuit should be turned is\",round(f/10**6,4),\"*10**6 Hz\""
   ]
  }
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